2008 TAHOE SHUDDERING WHILE DRIVING

What is your question?

TAHOE STARTS SHUDDERING WHEN DRIVING. DOES AT DIFFERENT SPEEDS. I CAN LET OFF GAS PEDAL JUST A TAD AND IT GOES AWAY. IF I GIVE IT A LITTLE GAS AND GET BACK TO SAME SPEED IT COMES BACK. I CALL IT SHUDDERING, BUT IT IS A SMALL VIVRATION YOU CAN FEEL IN CAR AND PASSENGER CCAN HEAR AND FEEL TOO. IT MIGHT BE 30, 40, 50, OR 60 MPH. NO CERTAIN SPEED. MOTOR MOUNTS GOOD, TRANS MOUNT GOOD, NEW BRAKES FRONT AND REAR, NEW TIRES WERE ROTATED AND BALANCE CHEC KED.

What makes this problem better or worse?

IF I LET OFF GAS A TAD IT STOPS. GIVE MORE GAS AND WILL DO IT AGAIN. COMES AND GOES.